<template>
    <div>
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <el-card>
            <el-alert :closable="false" type="info" center show-icon title="添加商品信息"></el-alert>
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <el-form :model="addForm" :rules="addFormRules" 
            ref="addFormRef" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex"
                :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="">
                            <el-cascader expand-trigger="hover"
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="cateProps"
                                @change="handleChange">
                            </el-cascader>                        
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item v-for="item in manyTableData" 
                        :key="item.attr_id" :label="item.attr_name">
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" :key="i" border
                                v-for="(cb,i) in item.attr_vals">
                                </el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item v-for="item in onlyTableData"
                        :key="item.attr_id" :label="item.attr_name">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload
                        class="upload-demo"
                        action="http://127.0.0.1:8888/api/private/v1/upload"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        :headers="headerObj"
                        :on-success="handleSuccess"
                        list-type="picture">
                        <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor> 
                        <el-button type="primary" class="addBtn" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'
export default {
    data(){
        return{
            activeIndex: '0',
            addForm: {
                goods_name: "",
                goods_price: 0,
                goods_weight:0,
                goods_number:0,
                goods_cat:[],   // 商品所属分类
                pics:[],
                goods_introduce: "",
                attrs:[]
            },
            addFormRules: {
                goods_name:[
                    { required: true, message: "请输入商品名称", trigger: "blur" }
                ],
                goods_price:[
                    { required: true, message: "请输入商品价格", trigger: "blur" }
                ],
                goods_weight:[
                    { required: true, message: "请输入商品重量", trigger: "blur" }
                ],
                goods_number:[
                    { required: true, message: "请输入商品数量", trigger: "blur" }
                ],
                goods_cat:[
                    { required: true, message: "请选择商品分类", trigger: "blur" }
                ]
            },
            // 商品分类列表
            catelist:[],
            cateProps:{
                label: "cat_name",
                value: "cat_id",
                children: "children"
            },
            manyTableData:[],   // 动态参数列表
            onlyTableData:[],
            headerObj:{
                Authorization: window.sessionStorage.getItem("token")
            },
            previewPath:"",
            previewVisible: false
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const { data:res } = await this.$http.get("categories")
            if(res.meta.status!==200)   return this.$message.error("获取商品分类失败")
            this.catelist = res.data
            // console.log(this.catelist)
        },
        // 商品分类的级联选择器发生变化 触发
        handleChange(){
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat = []
            }
            console.log(this.addForm.goods_cat)
        },
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName==="0" && this.addForm.goods_cat.length!==3){
                this.$message.error("请先选择商品分类")
                return false
            }
            
        },
        async tabClicked(){
            // 切换动态参数面板
            if(this.activeIndex==='1'){
                const { data:res } = await this.$http.get(
                `categories/${this.cateId}/attributes`,
                { params: {sel:"many" } })
                if(res.meta.status!==200)   return this.$message.error("失败")
                res.data.forEach(item => {
                    item.attr_vals =
                    item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            }else if(this.activeIndex==='2'){
                const { data:res } = await this.$http.get(
                `categories/${this.cateId}/attributes`,
                { params: {sel:"only" } })
                if(res.meta.status!==200)   return this.$message.error("失败")
                this.onlyTableData = res.data
            }

        },
        // 处理图片预览效果
        handlePreview(file){
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file){
            // console.log(file)
            const filePath = file.response.data.tmp_path
            const i = this.addForm.pics.findIndex(item=>
            item.pic === filePath)
            this.addForm.pics.splice(i,1)
            // console.log(this.addForm)
        },
        handleSuccess(response){
            console.log(response)
            this.addForm.pics.push( { pic: response.data.tmp_path } )
            // console.log(this.addForm)
        },
        add(){
            // console.log(this.addForm)
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid)  return this.$message.error("请填写必要的表单项")
                // 添加业务逻辑
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(",")
                
                this.manyTableData.forEach(item=>{
                    const newInfo = { 
                        attr_id:item.attr_id,
                        attr_value:item.attr_vals.join(" ")
                    }
                    this.addForm.attrs.push(newInfo)
                })
                this.onlyTableData.forEach(item=>{
                    const newInfo = { 
                        attr_id:item.attr_id,
                        attr_value:item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs

                console.log(form)
                // 向服务器发起请求 保存添加商品
                const { data:res } = await this.$http.post("goods", form )
                if(res.meta.status!==201)   return this.$message.error("添加失败")
                this.$message.success("添加商品成功")
                this.$router.push("/goods")
            })
        }

    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length===3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>
<style scoped>
    .el-checkbox{
        margin: 0 10px 0 0;
    }
    .previewImg{
        width: 100%;
    }
    .addBtn{
        margin-top: 15px;
    }
</style>